C# CONCEPTS

Sealed v/s Abstract Classes

The article demonstrates the use of abstract and sealed class

Photo by Sabrina Gelbart from Pexels

Learning Objectives

• What is a Sealed class
• What is an Abstract class

Prerequisites

Require a basic understanding of OOPS concepts.

Getting Started

Sealed Class

The sealed keyword permits restriction of the inheritance of a class or its members.

To mark a class as sealed, put the keyword sealed before the class definition. For example:

public sealed class D {
   // Class members here.
}

Sealed classes prevent derivation as they cannot act as a base class.

Common Usage of Sealed Class

Any method, indexer, property, or event on a derived class overriding a virtual member of the base class can declare that member sealed. It negates the virtual aspect of the member for any further inheritance. Simply putting a sealed keyword before the override keyword in the class member declaration. For example:

public class D : C {     
   public sealed override void Do() { } 
}